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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd403b9da7efab26a7ef3c4b4bc1516b983c07c89369d5c347d0a27bd171ca706' 
  AND token = '6Qg0QqDisI1OqEkcebC+2ICwK0oPI4FPIZYx4YPHZCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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