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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbd3201ca96d564f027ef85b0db64f37035b229a40fb65513dfcb4c9833adab' 
  AND token = 'HM7gmWXymMGaYkI4NzNcxXbJ+o/3yeekW25fxD7jCQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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