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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c6d4b03ac299fd349680a8e5eb993c91656c5ebfb8214ca4506c2bcf4a4fdf' 
  AND token = 'QzQ+aIIEPkPMBoqVbex32ZA/Y3O8emAXc2q/6PfvYh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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