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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b317771cbc7495770a47898f3753554988c7fcd5c4e1c84a40e9a812d65225de' 
  AND token = 'QuwGAoAJ2QRl4ErFSRZ2Uod/9LfL5PE9iq6V8EJbkIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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