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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c92889b4032ca3a8fb94c9a2dee8b71ef0d0a4d7112070cc2f89dd0c2311b25' 
  AND token = '5dVCjTpFriYuIqc64MHTvtSHhVXSW1bEEFiWGmfOPzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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