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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f591c5fa32b5de9837ed1478c9f977449b7a31f8605473a94b6932459daa488d' 
  AND token = 'J3ULFq5b5PXOXA8kmkSEM/0Kv2tDq8Lev4PzLeOM6Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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