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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac4ce1c24c72faf68b1324134a16bbbb11b8af9e5998d8321b2f235a5291bcd' 
  AND token = 'nsVXuBt54OqvD+uA6Jr1kYNZH8nkQ6EIP79o1HCqcX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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