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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e90b6971b983f852bdf7ce2c484a4561640766e39e201a1465f93a0f6ce247' 
  AND token = 'XtBUfA4AWyFO+dbevA/CriNT2WuOBkkNx+G4tRBCLb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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