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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162ab48758d03ff47a442de3e744ad5f719e424a0b01a0a1a07d613ab766b007' 
  AND token = 'ITmuv93A55b0fCVcAE/QXJhkUq1cHSMIenbGRh9S+1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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