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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2815186275c7750c97f79b95a94b1f8881fe2de51e423a0927a8c9484cb218' 
  AND token = 'rcmq3yKv0pMV7XYXnwAC7qv9PQCel5j4vd+k5jIUbQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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