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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0340aeb686d2ef12b67eb8e740a74b5c0b3e54b1f5512c8aef5518a8874012' 
  AND token = 'Wbnfsnoj7zuJgH2xVZj0CtNWVUxTdiDFs05jtSUrbQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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