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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361ee4cd6206369b63138c95871a0cf4e9e67a2a08a2c900bfe4f7852cd04b68' 
  AND token = '3equ++qB0xjdO8kCGAi09+AeRY9Tx6Sd81tESzxgyJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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