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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4ebb7229735120bdbf2c3666b9daa0a5be584bd19495a2a7ce632679942554' 
  AND token = 'kmmQ05scJPAuGxbGXpQkOZyHd+hrX7XZjhsDJt0yR7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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