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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14dbdcfd4e2c4f8587f07b30a8c94f427bc65f635a3154d48419b9c95c17d58' 
  AND token = '2zcprDqirIO5f4gj95zpxu35+8vHWciVC3eit86XNdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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