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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ed48653b1f8ad100da777cf1e00d99365e15f0285e309c8f2acc95d3ffd420' 
  AND token = '5epedQfg/DTkdqfZFIcRNrkL8o8na2yxbWrJbHG1sb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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