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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca81349e2a3fdae03d3617a4a961d05a0f5edb4c2488de3354045ea0559215fd' 
  AND token = 'pnOCFmPe0PZziWkybFnf+lFHssIEZAQHKXKG+dySrZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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