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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2623468038e0c5818631b43169bae7ccd923b6ba983f2d585427683e0bfa550' 
  AND token = 'P7X7gXZlEaprO6aLT8w+ttpFgWgeQgPDn5EJMURFa1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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