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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6cde88631c8ea4add3d23ad7c9aca90e1ce66c93f6eeac857f1eaccc3f9017' 
  AND token = 'DXz4i7W/PjjaArhvGzvZD9esqpi4vYBoU/ln7S75PFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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