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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9577a05d85377ce0d24746447f46c0eb93d635f4afafc6b8c066cd6362e1c011' 
  AND token = 'EgOC3rIPZWyZ3DwJ1UaBwxF4TI1Q1jiLYvCA1dPk9qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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