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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75d4e03ba9ac8a4e2c62cac9e2ad510d3224dc74b795e8fd09b4c2e9e9fd1de' 
  AND token = '4YU8FkWEDO8LaH8N1+9iRwds7qaHMRQjjRVc61kZH1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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