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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf95790382a5d8b0e009b8aa581d4608a91cf91a1f4a22b7e7eb39cbcc2b9ee' 
  AND token = 'Ti+Snx34IN6ocDLYneVMhfcJykRtNGVvKTkk+q5zXyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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