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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67c8b214c6c3ebd4cdb5f99cd4177e1850525a6d5bc5e1142e8dc3f9fc3598d' 
  AND token = 'GlqraeM3vDwX44va6E8llHNETs4QJRW1XMAhB6gLdwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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