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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe505b4d4d577d2a9cf649d69a95c45a284badb37ff8ff18f7b6976123818e79' 
  AND token = 'NshI1Q8QpugOls/HQD6eTLNnsOK/d88eVaTRJP7XyBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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