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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0eac6e73a9cec4818592c875a68abcc1a98decb3a8aa0af701db2af1e54322c' 
  AND token = 'V8bnfolWeTw6ik9rlhfurOmvcnXr+FW2ysRaI4Rg0bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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