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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e724d0d7eb5b58b45cecc4bf6da86552557055447a572d80bbd20781f31294' 
  AND token = 'mcNBEPawl4o555HcLJUukOZqSDwR6aTRcKXu7x6T7xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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