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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec90a2bb81710d40ec34e1a740abb7842f1ef9a4c9bc77b495ac7978e79ab475' 
  AND token = 'cDDQm5DeyaPaoaII/3CBZGFt71ERxol0+5EgofYvElU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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