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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc01412e2a53cec8572156fffb15dee36d7e69449625cefeefb06a1a60612139' 
  AND token = 'EAmTBYagxA6oF2/pSFa9IZWnqdQDbeKr4DktWqozATg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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