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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637af35c54af1a52df6d60c79e22d1e0114790e6352d49fc3aeb47a71b9d649a' 
  AND token = 'd3Zi8LL4AVkdWMeFVNPQaim1/fqnZFdMoEREx9Wl2qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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