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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367bbbce6d204f1416c59f0dc656121c644b2786857e95ecdd390c65c8073da6' 
  AND token = 'cQj2PlJzdUHpMA+sjQGAdjAu5sC6yZNcpDnKHK0a/+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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