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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c01e8a0802452f38482ca3c07f89982938b31508c18d3c872d49f25041ac73' 
  AND token = 'Cg0L63LQXTapdXm1s5Nqsf1LKVq1DcVIhJ3hzjAyBnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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