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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad17b22b308a6b87059ffce1cf1b10c81d31d55ec7b00828677498493db7aa17' 
  AND token = '/I5kpwVNGhpKOJB7w4BYQKUwQUpcbfiMhJePQ3x4fw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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