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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c236ae52314d08661a0e3782f8fbb65e62458c1e5c44c1f445428e3583092e9b' 
  AND token = 'E1tp9Iqns54mHKgnnD0EZOX88fwCz1k4mDDFcxiyT8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}