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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cf16447b6d250c3f7bc1276cb709219502920773c435d71e470e581994806f' 
  AND token = 'Jam0j8FAu6Tlg+501soOX1M7qUOtV3b83ileQc5rSac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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