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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556625338753e08bafe940d9531e1d1f263288361e9f5d0a38b01be939fee01c' 
  AND token = 'JXdMuULBQCqnNq6PpWPS4AnV03GN391+voDaDaMD6/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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