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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1fc2252136663a946d8df2d780faef61b913487d714bd8c854fdf6645b1ded' 
  AND token = '4KKHkpAQE3zft19/ZpDjN50R1fTkXS/Mnr+LlWVOc1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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