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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079ad34e706eb1518cf10ec1b12158878064af1a92f373cfa5dd76cff4ff44ce' 
  AND token = 'pMOFVELCllr+mWNA+Yn99btE3rHZ7PBVBoiAGVnvBDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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