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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705fe7e7208eb3706348f33658a55d78693527bd85e6c8f453cf5e39a82c6bac' 
  AND token = 'srsDMqOZTdxi1Gp+1YtNVi0UFfxiixn82QZtXw/Whx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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