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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff558db4631bf90dfb817fdf3ac8306dbe7d01dec61dd764ebf0d97a9950555' 
  AND token = 'huKbkb4iHiB/xarvoJGmEG1s+vYuWjd2+U1skN026IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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