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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2831c01c0a6440c1dec7d222bfa7797da7910b6ab86ad1d097a35b7a7ef157e0' 
  AND token = 'gzHTP32LtVsPDoxgMbn3D/FOS3esv0ino+yRbkN6rxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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