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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5503f9c58670aec12500ee0e22a6eef1c671be631f8fdb9052bddd9a8152502c' 
  AND token = 'fk74LLhKFreysPVUyyZg82GQSNDiJcAfGSTKSg2ZRCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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