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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd21172814522dce1f80962ec382c02d94726831eca3a88859025a27d6a89851' 
  AND token = 'IQ3OZsQQWI77JM/pfyDkqYeDUeBB/N6m0R6Xi6f0ob8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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