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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19907a8b979ff1f89f7d128b03c59d8ee966e38fe358a27b531d607976de14c0' 
  AND token = 'XWgqyZPYv9yg1U2lE9hHrIlO0ByuTbkX46qnp4jeIkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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