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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33cb86a837686c25d7eb57698c58d5b03bb4324f473f8c2f02853578d6224cd0' 
  AND token = 'CCjBtdpYghJS1MnLaCXiGAmdrU52WyHhNim4XC+Gv7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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