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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96fdb371aa59cee0aa882b470b74bd57350bfec83f04fb4c09341129a76da01' 
  AND token = 'cmhOYxy58SJA+XCknsfEJRTGy4oEY7T2W1WNmrUiFRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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