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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3322fb32ae62da7dee50da9a680f800bf02b032d196051eee0b913ed96cce92f' 
  AND token = 'CpuCoGnokxNQv+28ZTCr52GIUdq2ZLUdRCpIBirM2SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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