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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f111520c5471a7043a2cc26e4a05792c130f4cbfc8a268ef24813dbf7c1a3b87' 
  AND token = 'Fi8gAyoVQsnOe3jtVsTd55fvuW7iFkLFsyugspnOEYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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