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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711abbee18b9a9780b5099ccda7d804dc2462e2c6b1fa8eb9d89dc11108373f0' 
  AND token = 'gvu9N9D9aKhTLBYF6nQ1MMLoVxypaqJczMx1Q+yZeUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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