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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1eef5a515af5146a5024e1799265b43696e69d2d83d56354c670e3c7b2aea87' 
  AND token = 'AClL4hypnfwcPy4dwHDHjWQw/2BNu/rdYb2MxAfy0iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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