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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f04bcdff9bd6b00edb04cc37f78f0502305b8f90380684d4d6e56b42edd283' 
  AND token = 'fvhKcfcYwccJ4BVUXameubXqtaLjot4WRWlIo6Jbx3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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