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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7344183c9efb1ee9f595863880480e11e9e6f96be3f7adce437657ea9996b3' 
  AND token = 'LLGg1G1XRZ2DJTDCh/Aiq1vFAan1kruCZ7QRhFSv6Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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