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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1b6ec64e3de3b7d208f6a786a7c8d68860c55390f39e9e869e460bbcb3a8c7' 
  AND token = 'FVsZf6MxwZKNwFKRB2Ixxa2r/AgZ+lrhaBehz7kj4gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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