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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f862dc9b0d7a365da3f77d3543a67fd71e8483f07a837d66fc7aa4a803a82d' 
  AND token = 'agiST0CxceMJZ9aTr0FMjsVaszeRO+PnAXfyEFyljB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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