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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a378bf637e4472da5ca6ef03be29e050a6568734ef4a1de878cf5c1825c3860' 
  AND token = 'Fv+dZC7zgpceiqw9xSoBTl/P6KTo5gig77BbWP0iXQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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