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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab7707b7096db6ab58da23d069f8036438262d046020d81a6f918ee578e5e1a' 
  AND token = 'i8jWC3gFG/Liv8x0APLbTxcMjVI7wS1Rih5XRNmiLVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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